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Simplifying 3u + -21 = -21 Reorder the terms: -21 + 3u = -21 Add '21' to each side of the equation. -21 + 21 + 3u = -21 + 21 Combine like terms: -21 + 21 = 0 0 + 3u = -21 + 21 3u = -21 + 21 Combine like terms: -21 + 21 = 0 3u = 0 Solving 3u = 0 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Divide each side by '3'. u = 0 Simplifying u = 0
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